As for the GSM, I was referring to the fact that the Captain, unless he had a previous qualifying appointment between 1962 and the day would not have been entitled on day one or indeed week one.
I arrived at Khormaksar in April 1966 and at the time the clasp 'South Arabia' for the GSM had not been authorised, this did not happen until around June or July as I recall, at which time we were all able to put the ribbon up. We did have one officer on our squadron who already had the GSM, possibly for Borneo, and he already wore the ribbon on his bush jacket.